asmlinkage void machine_check(void);
asmlinkage void spurious_interrupt_bug(void);
+static unsigned int code_bytes = 64;
+
static inline void conditional_sti(struct pt_regs *regs)
{
if (regs->flags & X86_EFLAGS_IF)
static inline void preempt_conditional_sti(struct pt_regs *regs)
{
- preempt_disable();
+ inc_preempt_count();
if (regs->flags & X86_EFLAGS_IF)
local_irq_enable();
}
local_irq_disable();
/* Make sure to not schedule here because we could be running
on an exception stack. */
- preempt_enable_no_resched();
+ dec_preempt_count();
}
int kstack_depth_to_print = 12;
-#ifdef CONFIG_KALLSYMS
void printk_address(unsigned long address, int reliable)
{
+#ifdef CONFIG_KALLSYMS
unsigned long offset = 0, symsize;
const char *symname;
char *modname;
char *delim = ":";
- char namebuf[128];
- char reliab[4] = "";;
+ char namebuf[KSYM_NAME_LEN];
+ char reliab[4] = "";
symname = kallsyms_lookup(address, &symsize, &offset,
&modname, namebuf);
strcpy(reliab, "? ");
if (!modname)
- modname = delim = "";
+ modname = delim = "";
printk(" [<%016lx>] %s%s%s%s%s+0x%lx/0x%lx\n",
address, reliab, delim, modname, delim, symname, offset, symsize);
-}
#else
-void printk_address(unsigned long address, int reliable)
-{
printk(" [<%016lx>]\n", address);
-}
#endif
+}
static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
unsigned *usedp, char **idp)
* severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
*/
-static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
+static inline int valid_stack_ptr(struct thread_info *tinfo,
+ void *p, unsigned int size, void *end)
+{
+ void *t = tinfo;
+ if (end) {
+ if (p < end && p >= (end-THREAD_SIZE))
+ return 1;
+ else
+ return 0;
+ }
+ return p > t && p < t + THREAD_SIZE - size;
+}
+
+/* The form of the top of the frame on the stack */
+struct stack_frame {
+ struct stack_frame *next_frame;
+ unsigned long return_address;
+};
+
+
+static inline unsigned long print_context_stack(struct thread_info *tinfo,
+ unsigned long *stack, unsigned long bp,
+ const struct stacktrace_ops *ops, void *data,
+ unsigned long *end)
{
- void *t = (void *)tinfo;
- return p > t && p < t + THREAD_SIZE - 3;
+ struct stack_frame *frame = (struct stack_frame *)bp;
+
+ while (valid_stack_ptr(tinfo, stack, sizeof(*stack), end)) {
+ unsigned long addr;
+
+ addr = *stack;
+ if (__kernel_text_address(addr)) {
+ if ((unsigned long) stack == bp + 8) {
+ ops->address(data, addr, 1);
+ frame = frame->next_frame;
+ bp = (unsigned long) frame;
+ } else {
+ ops->address(data, addr, bp == 0);
+ }
+ }
+ stack++;
+ }
+ return bp;
}
void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
if (!tsk)
tsk = current;
+ tinfo = task_thread_info(tsk);
if (!stack) {
unsigned long dummy;
stack = (unsigned long *)tsk->thread.sp;
}
- /*
- * Print function call entries within a stack. 'cond' is the
- * "end of stackframe" condition, that the 'stack++'
- * iteration will eventually trigger.
- */
-#define HANDLE_STACK(cond) \
- do while (cond) { \
- unsigned long addr = *stack++; \
- /* Use unlocked access here because except for NMIs \
- we should be already protected against module unloads */ \
- if (__kernel_text_address(addr)) { \
- /* \
- * If the address is either in the text segment of the \
- * kernel, or in the region which contains vmalloc'ed \
- * memory, it *may* be the address of a calling \
- * routine; if so, print it so that someone tracing \
- * down the cause of the crash will be able to figure \
- * out the call path that was taken. \
- */ \
- ops->address(data, addr, 1); \
- } \
- } while (0)
+#ifdef CONFIG_FRAME_POINTER
+ if (!bp) {
+ if (tsk == current) {
+ /* Grab bp right from our regs */
+ asm("movq %%rbp, %0" : "=r" (bp):);
+ } else {
+ /* bp is the last reg pushed by switch_to */
+ bp = *(unsigned long *) tsk->thread.sp;
+ }
+ }
+#endif
+
+
/*
* Print function call entries in all stacks, starting at the
if (estack_end) {
if (ops->stack(data, id) < 0)
break;
- HANDLE_STACK (stack < estack_end);
+
+ bp = print_context_stack(tinfo, stack, bp, ops,
+ data, estack_end);
ops->stack(data, "<EOE>");
/*
* We link to the next stack via the
if (stack >= irqstack && stack < irqstack_end) {
if (ops->stack(data, "IRQ") < 0)
break;
- HANDLE_STACK (stack < irqstack_end);
+ bp = print_context_stack(tinfo, stack, bp,
+ ops, data, irqstack_end);
/*
* We link to the next stack (which would be
* the process stack normally) the last
/*
* This handles the process stack:
*/
- tinfo = task_thread_info(tsk);
- HANDLE_STACK (valid_stack_ptr(tinfo, stack));
-#undef HANDLE_STACK
+ bp = print_context_stack(tinfo, stack, bp, ops, data, NULL);
put_cpu();
}
EXPORT_SYMBOL(dump_trace);
unsigned long dummy;
unsigned long bp = 0;
+#ifdef CONFIG_FRAME_POINTER
+ if (!bp)
+ asm("movq %%rbp, %0" : "=r" (bp):);
+#endif
+
printk("Pid: %d, comm: %.20s %s %s %.*s\n",
current->pid, current->comm, print_tainted(),
init_utsname()->release,
void show_registers(struct pt_regs *regs)
{
int i;
- int in_kernel = !user_mode(regs);
unsigned long sp;
const int cpu = smp_processor_id();
struct task_struct *cur = cpu_pda(cpu)->pcurrent;
+ u8 *ip;
+ unsigned int code_prologue = code_bytes * 43 / 64;
+ unsigned int code_len = code_bytes;
sp = regs->sp;
+ ip = (u8 *) regs->ip - code_prologue;
printk("CPU %d ", cpu);
__show_regs(regs);
printk("Process %s (pid: %d, threadinfo %p, task %p)\n",
* When in-kernel, we also print out the stack and code at the
* time of the fault..
*/
- if (in_kernel) {
+ if (!user_mode(regs)) {
+ unsigned char c;
printk("Stack: ");
_show_stack(NULL, regs, (unsigned long *)sp, regs->bp);
+ printk("\n");
- printk("\nCode: ");
- if (regs->ip < PAGE_OFFSET)
- goto bad;
-
- for (i=0; i<20; i++) {
- unsigned char c;
- if (__get_user(c, &((unsigned char*)regs->ip)[i])) {
-bad:
+ printk(KERN_EMERG "Code: ");
+ if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
+ /* try starting at RIP */
+ ip = (u8 *) regs->ip;
+ code_len = code_len - code_prologue + 1;
+ }
+ for (i = 0; i < code_len; i++, ip++) {
+ if (ip < (u8 *)PAGE_OFFSET ||
+ probe_kernel_address(ip, c)) {
printk(" Bad RIP value.");
break;
}
- printk("%02x ", c);
+ if (ip == (u8 *)regs->ip)
+ printk("<%02x> ", c);
+ else
+ printk("%02x ", c);
}
}
printk("\n");
add_taint(TAINT_DIE);
/* Executive summary in case the oops scrolled away */
printk(KERN_ALERT "RIP ");
- printk_address(regs->ip, regs->bp);
+ printk_address(regs->ip, 1);
printk(" RSP <%016lx>\n", regs->sp);
if (kexec_should_crash(current))
crash_kexec(regs);
tsk->thread.trap_no = trapnr;
if (show_unhandled_signals && unhandled_signal(tsk, signr) &&
- printk_ratelimit())
+ printk_ratelimit()) {
printk(KERN_INFO
- "%s[%d] trap %s ip:%lx sp:%lx error:%lx\n",
+ "%s[%d] trap %s ip:%lx sp:%lx error:%lx",
tsk->comm, tsk->pid, str,
regs->ip, regs->sp, error_code);
+ print_vma_addr(" in ", regs->ip);
+ printk("\n");
+ }
if (info)
force_sig_info(signr, info, tsk);
tsk->thread.trap_no = 13;
if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) &&
- printk_ratelimit())
+ printk_ratelimit()) {
printk(KERN_INFO
- "%s[%d] general protection ip:%lx sp:%lx error:%lx\n",
+ "%s[%d] general protection ip:%lx sp:%lx error:%lx",
tsk->comm, tsk->pid,
regs->ip, regs->sp, error_code);
+ print_vma_addr(" in ", regs->ip);
+ printk("\n");
+ }
force_sig(SIGSEGV, tsk);
return;
return 0;
}
early_param("kstack", kstack_setup);
+
+
+static int __init code_bytes_setup(char *s)
+{
+ code_bytes = simple_strtoul(s, NULL, 0);
+ if (code_bytes > 8192)
+ code_bytes = 8192;
+
+ return 1;
+}
+__setup("code_bytes=", code_bytes_setup);
projects / linux-2.6 / blobdiff